Newton's first law of motion describes the following:

Physical independence of force is a consequence of

Which one of the following persons is in an inertial frame of reference?

$A$ stone tied to a string is rotated in a circle. If the string is cut,the stone flies away from the circle because

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ An electric fan continues to rotate for some time after the current is switched off.
Reason $R:$ The fan continues to rotate due to inertia of motion.
In the light of the above statements,choose the most appropriate answer from the options given below.

What is inertia?